> The seemingly high occurence of rare events is an artifact of how much we're measuring. If you have a thousand weather stations, every year you'll see a "thou

> The seemingly high occurence of rare events is an artifact of how much we're measuring. If you have a thousand weather stations, every year you'll see a "thousand year" event at one of them. We just didn't notice the other 999 that didn't. That would only be true if all those weather stations are fully independent. They're definitively not. Drives should be independent, but all drives in a datacenter would similarly share their environment. Run the datacenter too hot and your MTBF will be out of spec.